Read “True Green/Is Less More?” http://historicsites.wordpress.com/2009/04/02/true-green-is-less-more/ by Barbara Campagna, the Graham Gund Architect at the National Trust for Historic Preservation.
In the article, Campagna examines the installation and use of HVAC in historic buildings, using National Trust Historic Sites, Cliveden, Woodrow Wilson House, and President Lincoln’s Cottage as examples.